What is the author's style in That Used to Be Us: How America Fell Behind in the World It Invented and How We Can Come Back by Thomas L. Friedman?

Journalist Thomas L. Friedman and writer, professor. and foreign policy expert, Michael Mandelbaum wrote "That Used to Be Us." Both men are seasoned professional writers and have written a detailed summary of what is wrong with America from their perspective, which is based on their obviously extensive research and information gathering as non-fiction writers. Friedman is a recipient of the Pulitzer Prize three times for his writing skill as a New York Times reporter. In addition to "That Used to Be Us," Friedman has written five other bestselling books, including in 2005, "The World is Flat."